Quarterly report pursuant to Section 13 or 15(d)

Share-Based Payments - Employee Activity Non-vested Shares (Details)

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Share-Based Payments - Employee Activity Non-vested Shares (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense $ 2,417 $ 2,064 $ 4,678 $ 4,026
Employee Non-vested Shares [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Grants, vesting period (in years)     3 years  
Outstanding and non-vested, beginning of period (in shares)     227  
Stock Issued During Period, Shares, Restricted Stock Award, Gross     174  
Shares Vested in Period     (107)  
Shares Forfeited in Period     (2)  
Outstanding and non-vested, end of period (in shares) 292   292  
Outstanding and non-vested, weighted-average grant date fair value, beginning of period     $ 47  
Grants in Period, Weighted Average Grant Date Fair Value     59  
Vested in Period, Weighed-average grant date fair value     56  
Forfeited in period (in dollars per share)     52  
Outstanding and non-vested, weighted-average grant date fair value, end of period $ 54   $ 54  
Outstanding and non-vested, aggregate grant date fair value     $ 15,758  
Share-based compensation expense $ 1,566 1,279 2,965 2,518
Tax benefit related to share-based expense     741 917
Unrecognized share-based compensation, net of estimated forfeitures $ 13,371 $ 8,826 $ 13,371 $ 8,826
Weighted average period over which unrecognized compensation will be recognized (years)     2 years 11 days